websockets don't work on Free F1 plan

[bpmct]

$PASSWORD must be left blank to use code-server --link instead of directly using Azure's domain+TLS. I believe this is due to the web socket limit on the free tier: https://docs.microsoft.com/en-us/azure/app-service/faq-app-service-linux#web-sockets

[gmuth]

Does code-server exceed the current (Jan 2024) limits?

"Web Sockets are now supported for Linux apps on Free App Service plans. We support up to five web socket connections on Free App Service plans. Exceeding this limit results in an HTTP 429 (Too Many Requests) response."